Punchout graphics issue

TheBasement

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I know the bottom monitor needs a cap kit (1/2 inch of video smashed at top) but I think the PCB has a video memory issue. The black bars move left and right during gameplay (so I don't think its the monitor) and Glass Joe has a nice purple rash. I suspect video memory, but the 8416 RAM is soldered on board so it will make it more difficult. Reseating all other chips didn't help. The manual says all RAM is 6116 but it is 8416's on this board, different manufacturer, same memory type.

I anyone has any hints or tips as to which memory, bank or trace to check I would appreciate it, or if it might have to do with a 74xxx chip not switching memory propery.

punchout1.jpg


punchout2.jpg
 
ok well if its nothing to do with your monitor, and after switching video cables you still have the problem, im pretty shure the lines you have are Jail Bars. I just fixed this with my Punch-Out!! PCB

For JAIL BARS, if its a eeprom problem.. you have a bad eeprom at location 8-N and/or 8-P on the video board.. i had to replace 8-P on mine, but befor i did that i set the dip switch for a rom test and it tested everything was ok but i replaced 8-P and the 'Jail Bars' went away

as for the color problem, im not shure what could help, have you tryed adjusting the pots on the back of the monitor? also what happens when you try switching the video cables around?

ill watch this thread and see what happens and try to help u the best i can
 
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i posted something like this with problems to my pcb and it has some good info on the page on board repair
http://forums.arcade-museum.com/showthread.php?t=122232

also there is a punch-out repair log that has helped me ALOT with fixing some problems i had with mine, and there is ALOT of good info there about fixing Punch-Out!! pcb's
http://www.2coinsperplay.com/Tech/Video/repairs/repair Logs/Punch-Out!/Punch-Out! Repair Log.html

and if you need some new chips, most of them can be found at
http://www.mikesarcade.com/cgi-bin/store.pl?action=search&category=Components
 
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Voltages were good and it wasn't a monitor issue. I ordered a "tested working" board off ebay to swap out with mine, and apparently their "testing working" board was missing its fighters. Yes, you were fighting a ghost. Reseating all chips didn't fix the issue. I was able to start chip swapping with my board since this new board had a totally different issue. It took me 3 hours swapping 1 chip at a time, hooking it up, turning the game on, etc., but I finally tracked it all down.

It turns out 8P was bad on my Video board. That caused the jailbars. A bad B-8E chip on the BAK board caused the purple rash on Glass Joe. Swapping out 2 chips fixed all my problems.

So the good news is I now had a working boardset, the bad news is I wasn't going to pay full price for a "parts" board. I messaged the ebay seller, explained the problem with his board and we agreed to a 50% refund. It was worth it to not have to ship it back at my expense, I wouldn't have to have 2 EEPROM's reprogrammed, and I still have a parts board if I want to eventually fix or keep in case more chips go bad. I was also able to figure out the "missing fighter" on the other board was a bad 74283 chip out of a bank of them on the Video board. Good to know in case I decide to completely repair the other one.

In the picture below, all is well now. The green fighter is really all there, he was just moving so it got kind of blurry. Happy Ending!

punchout32.jpg
 
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awsom im glad everything turned out good,, do you mind posting how much you paid for the *simi-working* punchout board? i have 2 extra ones and iv been thinking about selling em.. not shure yet,,
 
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